If talking or writing about death of a beloved pet I think it is important not to add to the pain (graphic description of illness, describing the pain the animal must feel) but to try and relieve the loss with some idea that a child might take comfort in and to try and help to them move on.

A lot depends on the child's age, maturity level and experience with the topic. I would not have a problem with my 8-year-old reading something like this, but he and I have discussed disease and death and although it might be emotional for him, I think he should be aware of the possibilities of a pet getting sick in this way and dying. For a younger child, however, it might be a bit too much information. When mine was about 4 I told him that an animal's spirit went to Heaven (He asked after seeing a dead butterfly), so he understood that death was different than being asleep, but this type of graphic detail was not discussed until more recently.

A very young child will definitely cry at this premise. The story would be better for children who are at least old enough to comprehend the idea of death. Parents will definitely play an important role in explaining this topic to their kids.

I find it an incredibly important topic to discuss with children. When I experienced the death of a pet when I was young, I had no idea how to deal with it. I had never lost anyone or any other pet and I was devastated. I think to bring the discussion into existence is important for young minds. It will help with both the death of pets, friends, and other family members.